EP2326752B1 - Coating mask for electrolytically coating a peripheral region on an outer surface of a cylindrical body - Google Patents

Coating mask for electrolytically coating a peripheral region on an outer surface of a cylindrical body Download PDF

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Publication number
EP2326752B1
EP2326752B1 EP09776102A EP09776102A EP2326752B1 EP 2326752 B1 EP2326752 B1 EP 2326752B1 EP 09776102 A EP09776102 A EP 09776102A EP 09776102 A EP09776102 A EP 09776102A EP 2326752 B1 EP2326752 B1 EP 2326752B1
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EP
European Patent Office
Prior art keywords
coating
mask
coating mask
groove
piston
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09776102A
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German (de)
French (fr)
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EP2326752A2 (en
Inventor
Rudolf Bergmann
Christopher Rotsch
Franz Gessler
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Mahle International GmbH
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Mahle International GmbH
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Publication of EP2326752A2 publication Critical patent/EP2326752A2/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/02—Electroplating of selected surface areas
    • C25D5/022—Electroplating of selected surface areas using masking means
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/10—Bearings

Definitions

  • the invention relates to a coating mask for the electrolytic coating of a circumferential region on the lateral surface of a cylindrical body according to the preamble of claim 1 and to the use of the coating mask for coating a piston ring groove of a piston for an internal combustion engine according to claim 7.
  • the sleeves are offset by a plurality of perpendicular to the piston axis movable pressure rods via an inclined contact surface in motion parallel to the piston axis.
  • the coating mask according to the invention consists of an elastically yielding material, this must be done using a simple mechanism only be stretched radially outward to make room for a piston whose piston ring groove to be coated.
  • Fig. 1 shows a coating mask 1 in plan view with an inner opening 2 for receiving a cylindrical body, for example a piston 38 (FIG. Fig. 5 ), of which a circumferential region, for example a piston ring groove 39 (FIG. Fig. 5 ), to be coated.
  • the coating mask 1 consists of rubber, preferably of silicone, and regularly distributed over its circumference eight axially located openings 3 to 10, the purpose of which, as will be explained in more detail below, is to Dome 11 to 18 of an expansion device 19 (FIGS. Fig. 4 ), with the aid of which the coating mask 1 can be stretched in the direction of the arrows 20 to 23, so that thereby the inner opening 2 is enlarged, after which in the inner opening 2, a piston can be inserted.
  • the coating mask 1 has areas 7 to 31 with a thinner wall, which increase the elasticity of the coating mask 1, so that the coating mask 1 can be stretched more easily in the direction of the arrows 20 to.
  • Dashed lines are drawn in Fig. 1 a ring line 32, which can be led to an electrolyte via an inlet channel 33. Via supply channels 34, 35, 36 ... the electrolyte then passes into a circumferential coating groove 37, which, as Fig. 5 shows is closed by the piston ring groove 39 of a piston 38 to be coated. Subsequently, the electrolyte is discharged via a discharge channel 40 from the coating mask 1.
  • FIGS. 2 and 3 are cuts along the line AA in Fig. 1 and show that the coating mask 1 has two ring lines 32 and 32 ', arranged one behind the other in the axial direction, which are each connected to the coating groove 37 via supply channels 35 and 35' distributed uniformly around the circumference.
  • the inner opening 2 has in this case starting from the centrally located coating groove 37 a funnel-shaped widening in both axial directions form.
  • the electrolyte passes via the inlet channel 33 into the lower ring line 32 ', flows via the lower feed channels 35' in the closed from the piston to be coated coating groove 37, from here via the upper feed channels 35 in the upper ring line 32, and is from here about the drainage channel 40 discharged from the coating mask 1.
  • the outlets 41 of the feed channels 35, 35 'in the coating groove 37th are also recognized in the FIGS. 2 and 3 also the outlets 41 of the feed channels 35, 35 'in the coating groove 37th
  • ring electrodes 42 and 43 arranged with schematically indicated electrical connections 53 and 54.
  • the present coating mask 1 can be used to electrolytically coat the flanks of the piston ring groove 39 of the piston 38 with, for example, iron.
  • the ring electrodes 42 and 43 are connected as anodes, that is, connected via the terminals 53 and 54 to the positive pole of a DC voltage source
  • the piston 38 is connected as a cathode, that is, connected to the negative pole of the DC voltage source
  • the coating mask 1 can also be used to anodically oxidize the flanks of the piston ring groove 39 of the piston 38.
  • the piston 38 is connected as an anode, that is, connected to the positive pole of a DC voltage source
  • the ring electrodes 42 and 43 are connected as cathodes, ie, connected via the terminals 53 and 54 to the negative pole of a DC voltage source, and is used as an electrolyte, for example Sulfuric acid supplied via the inlet channel 33 of the coating mask 1.
  • the coating mask 1 is first of all applied via its openings 3 to 9 to the domes 11 to 18 of the stretching device 19 Fig. 4 pushed. Subsequently, the domes 11 to 18 are displaced radially outward, so that the coating mask 1 is stretched in the direction of the arrows 20 to 23. Now, the piston 38 is inserted into the thereby extended, inner opening 2, after which the domes 11 to 18 are moved so far radially inward until the sealing lips 44 and 45, of which the coating groove 37 is limited, according to Fig. 5 Both sides of the piston ring groove 39 to be coated on the lateral surface of the body, here on the ring portion 48 of the piston 38, come to rest and thus hermetically seal the coating groove 37 and the piston ring groove 39 of the piston 38 to be coated.
  • the flanks of Kolbenringnut 39 of the piston 38 are coated sufficiently, so that after the electrolyte has been discharged completely from the ring lines 32 and 32 ', the ring lines 32 and 32' and the coating groove 37 with hot hot steam at 130 ° C. be rinsed. Subsequently, the domes 11 to 18 of the stretching device 19 are moved radially outward, so that Also, the diameter of the inner opening 2 is increased and the piston 38 can be removed from the coating mask 1.
  • the coating mask 1 is produced in the casting process, wherein initially in a mold 49, as in Fig. 7 is shown, two loop templates 50 are inserted, which consist of sintered plastic, and of which a in Fig. 6 is shown.
  • the loop template 50 according to Fig. 6 allows the inlet channel 33 and feed channels 34, 35, 36, ... recognize.
  • the mold 49 according to Fig. 7 are the feed channels 34 to 36 in conjunction with a G demkem 51, which ensures by its special shape that during the casting process, the inner opening 2 and the coating groove 37 are completely formed.
  • the ring line templates 50 remain after the casting process in the coating mask 1 and have predetermined breaking points 52, which in the first coating operation, when the coating mask 1 and thus the ring line template 50 are stretched radially outwardly for the first time, so that thereby the elasticity of the coating mask. 1 not hindered. It is advantageous to incorporate in the production of the ring line templates 50 each have a ring electrode in the ring line templates 50 with.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Die Erfindung betrifft eine Beschichtungsmaske zum elektrolytischen Beschichten eines umlaufenden Bereiches auf der Mantelfläche eines zylinderförmigen Körpers nach dem Oberbegriff des Anspruches 1 und die Verwendung der Beschichtungsmaske zur Beschichtung einer Kolbenringnut eines Kolbens für einen Verbrennungsmotor nach Anspruch 7.The invention relates to a coating mask for the electrolytic coating of a circumferential region on the lateral surface of a cylindrical body according to the preamble of claim 1 and to the use of the coating mask for coating a piston ring groove of a piston for an internal combustion engine according to claim 7.

Aus der Patentschrift US 6 821 408 ist eine Vorrichtung zur anodischen Oxydation eines umlaufenden Bereiches auf der Mantelfläche eines zylindrischen Körpers, insbesondere der Kolbenringnut eines Kolbens für einen Verbrennungsmotor bekannt, wobei der zu beschichtende Bereich beidseitig von zwei umlaufenden und zunächst im Schnitt runden Dichtringen dadurch hermetisch abgedichtet wird, dass auf die Dichtringe von je einer Hülse Druck ausgeübt wird, bis sich die Dichtringe oval verformen, wobei diese Ovalität senkrecht zur Mantelfläche des Kolbens ausgerichtet ist. Hierdurch gelangen die Dichtringe zur Anlage an die Mantelfläche beidseitig der Kolbenringnut und verschließen diesen Bereich hermetisch. Anschließend wird ein Elektrolyt in diesen Bereich eingeleitet und die darin befindliche Kolbenringnut anodisch oxidiert. Nachteilig ist, dass ein sehr komplizierter Mechanismus zur Verformung der Dichtringe erforderlich ist. Hierbei werden die Hülsen von mehreren senkrecht zur Kolbenachse beweglichen Druckstangen über eine schräge Kontaktfläche in Bewegung parallel zur Kolbenachse versetzt.From the patent US 6,821,408 is a device for anodic oxidation of a circumferential region on the lateral surface of a cylindrical body, in particular the piston ring groove of a piston for an internal combustion engine known, wherein the area to be coated is hermetically sealed by both circumferential and initially in section round sealing rings characterized in that the sealing rings each of a sleeve pressure is applied until the sealing rings deform oval, this ovality is aligned perpendicular to the lateral surface of the piston. As a result, the sealing rings come to bear against the lateral surface on both sides of the piston ring groove and close this area hermetically. Subsequently, an electrolyte is introduced into this area and the piston ring groove located therein oxidized anodically. The disadvantage is that a very complicated mechanism for deformation of the sealing rings is required. Here, the sleeves are offset by a plurality of perpendicular to the piston axis movable pressure rods via an inclined contact surface in motion parallel to the piston axis.

Diesen Nachteil des Standes der Technik zu vermeiden ist Aufgabe der Erfindung. Gelöst wird diese Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.To avoid this disadvantage of the prior art is an object of the invention. This problem is solved with the features in the characterizing part of the main claim. Advantageous embodiments of the invention are the subject of the dependent claims.

Da die Beschichtungsmaske gemäß der Erfindung aus einem elastisch nachgiebigen Material besteht, muss diese unter Verwendung eines einfachen Mechanismus nur nach radial außen gedehnt werden, um Platz für einen Kolben zu machen, dessen Kolbenringnut beschichtet werden soll.Since the coating mask according to the invention consists of an elastically yielding material, this must be done using a simple mechanism only be stretched radially outward to make room for a piston whose piston ring groove to be coated.

Die Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigen

Fig. 1
eine Draufsicht auf eine Beschichtungsmaske für Kolbenringnuten, in die eine Ringleitung für einen Elektrolyten gestrichelt eingezeichnet ist,
Fig. 2
einen Schnitt durch die Beschichtungsmaske entlang der Linie AA in Fig. 1,
Fig. 3
einen vergrößerten Ausschnitt des in Fig. 2 dargestellten Schnittbildes,
Fig. 4
eine perspektivische Darstellung einer Dehnvorrichtung, mit deren Hilfe die Beschichtungsmaske nach radial außer gedehnt wird, um einen Kolben einführen zu können,
Fig. 5
einen Schnitt durch die Beschichtungsmaske mit eingeführtem Kolben, dessen erste Kolbenringnut beschichtet wird,
Fig. 6
eine Ringleitungsschablone zur Herstellung der Ringleitung und
Fig. 7
eine Gießform mit eingelegter Ringleitungsschablone zur gießtechnischen Herstellung der Beschichtungsmaske.
The invention will be described below with reference to the drawings. Show it
Fig. 1
a top view of a coating mask for piston ring grooves, in which a ring line for an electrolyte is shown in dashed lines,
Fig. 2
a section through the coating mask along the line AA in Fig. 1 .
Fig. 3
an enlarged section of the in Fig. 2 shown sectional picture,
Fig. 4
a perspective view of an expanding device, with the help of the coating mask is radially expanded except to be able to introduce a piston,
Fig. 5
a section through the coating mask with inserted piston, the first piston ring groove is coated,
Fig. 6
a ring line template for the production of the ring line and
Fig. 7
a mold with inserted ring line template for the casting production of the coating mask.

Fig. 1 zeigt eine Beschichtungsmaske 1 in Draufsicht mit einer inneren Öffnung 2 zur Aufnahme eines zylinderförmigen Körpers, beispielsweise eines Kolbens 38 (Fig. 5), von dem ein umlaufender Bereich, beispielsweise eine Kolbenringnut 39 (Fig. 5), beschichtet werden soll. Die Beschichtungsmaske 1 besteht aus Kautschuk, vorzugsweise aus Silikon, und weist regelmäßig über ihren Umfang verteilt acht axial liegende Öffnungen 3 bis 10 auf, deren Zweck, wie weiter unten näher erläutert wird, darin besteht, Dome 11 bis 18 einer Dehnvorrichtung 19 (Fig. 4) aufzunehmen, mit deren Hilfe die Beschichtungsmaske 1 in Richtung der Pfeile 20 bis 23 gedehnt werden kann, sodass hierdurch auch die innere Öffnung 2 vergrößert wird, wonach in die innere Öffnung 2 ein Kolben eingeführt werden kann. Fig. 1 shows a coating mask 1 in plan view with an inner opening 2 for receiving a cylindrical body, for example a piston 38 (FIG. Fig. 5 ), of which a circumferential region, for example a piston ring groove 39 (FIG. Fig. 5 ), to be coated. The coating mask 1 consists of rubber, preferably of silicone, and regularly distributed over its circumference eight axially located openings 3 to 10, the purpose of which, as will be explained in more detail below, is to Dome 11 to 18 of an expansion device 19 (FIGS. Fig. 4 ), with the aid of which the coating mask 1 can be stretched in the direction of the arrows 20 to 23, so that thereby the inner opening 2 is enlarged, after which in the inner opening 2, a piston can be inserted.

Zwischen den Öffnungen 3 bis 10 weist die Beschichtungsmaske 1 Bereiche 24 bis 31 mit dünnerer Wandung auf, die die Elastizität der Beschichtungsmaske 1 erhöhen, sodass die Beschichtungsmaske 1 leichter in Richtung der Pfeile 20 bis 23 gedehnt werden kann.Between the openings 3 to 10, the coating mask 1 has areas 7 to 31 with a thinner wall, which increase the elasticity of the coating mask 1, so that the coating mask 1 can be stretched more easily in the direction of the arrows 20 to.

Gestrichelt eingezeichnet ist in Fig. 1 eine Ringleitung 32, der über einen Zulaufkanal 33 ein Elektrolyt zu geführt werden kann. Über Zuführungskanäle 34, 35, 36 ... gelangt der Elektrolyt dann in eine umlaufende Beschichtungsnut 37, die, wie Fig. 5 zeigt, von der Kolbenringnut 39 eines Kolbens 38, die beschichtet werden soll, verschlossen wird. Anschließend wird der Elektrolyt über einen Ablaufkanal 40 aus der Beschichtungsmaske 1 abgeleitet.Dashed lines are drawn in Fig. 1 a ring line 32, which can be led to an electrolyte via an inlet channel 33. Via supply channels 34, 35, 36 ... the electrolyte then passes into a circumferential coating groove 37, which, as Fig. 5 shows is closed by the piston ring groove 39 of a piston 38 to be coated. Subsequently, the electrolyte is discharged via a discharge channel 40 from the coating mask 1.

Die Figuren 2 und 3 sind Schnitte entlang der Linie AA in Fig. 1 und zeigen, dass die Beschichtungsmaske 1 zwei in axialer Richtung hintereinander angeordnete Ringleitungen 32 und 32' aufweist, die jeweils über gleichmäßig über den Umfang verteilte Zuführungskanäle 35 und 35' mit der Beschichtungsnut 37 verbunden sind. Die innere Öffnung 2 hat hierbei ausgehend von der zentral liegenden Beschichtungsnut 37 eine in beide axiale Richtungen trichterförmig sich erweiternde Form.The FIGS. 2 and 3 are cuts along the line AA in Fig. 1 and show that the coating mask 1 has two ring lines 32 and 32 ', arranged one behind the other in the axial direction, which are each connected to the coating groove 37 via supply channels 35 and 35' distributed uniformly around the circumference. The inner opening 2 has in this case starting from the centrally located coating groove 37 a funnel-shaped widening in both axial directions form.

Hierbei gelangt der Elektrolyt über den Zulaufkanal 33 in die untere Ringleitung 32', fließt über die unteren Zuführungskanäle 35' in die vom zu beschichtenden Kolben verschlossene Beschichtungsnut 37, von hier über die oberen Zuführungskanäle 35 in die obere Ringleitung 32, und wird von hier über den Ablaufkanal 40 aus der Beschichtungsmaske 1 ausgeleitet. Zu erkennen sind in den Figuren 2 und 3 auch die Austritte 41 der Zuführungskanäle 35, 35' in die Beschichtungsnut 37.In this case, the electrolyte passes via the inlet channel 33 into the lower ring line 32 ', flows via the lower feed channels 35' in the closed from the piston to be coated coating groove 37, from here via the upper feed channels 35 in the upper ring line 32, and is from here about the drainage channel 40 discharged from the coating mask 1. To be recognized in the FIGS. 2 and 3 also the outlets 41 of the feed channels 35, 35 'in the coating groove 37th

In den Ringleitungen 32, 32' sind, wie in Fig. 2 und 3 gut erkennbar ist, Ringelektroden 42 und 43 mit schematisch angedeuteten elektrischen Anschlüssen 53 und 54 angeordnet. Die vorliegende Beschichtungsmaske 1 kann dazu verwendet werden, die Flanken der Kolbenringnut 39 des Kolbens 38 elektrolytisch beispielsweise mit Eisen zu beschichten. Hierzu werden die Ringelektroden 42 und 43 als Anoden geschaltet, d.h., über die Anschlüsse 53 und 54 an den Pluspol einer Gleichspannungsquelle angeschlossen, wird der Kolben 38 als Kathode geschaltet, d.h., an den Minuspol der Gleichspannungsquelle angeschlossen, und wird ein eisenhaltiger Elektrolyt, beispielsweise eine Eisenlösung auf Sulfatbasis, über den Zulaufkanal 33 in die Beschichtungsmaske 1 eingeleitet.In the ring lines 32, 32 'are, as in FIGS. 2 and 3 is clearly visible, ring electrodes 42 and 43 arranged with schematically indicated electrical connections 53 and 54. The present coating mask 1 can be used to electrolytically coat the flanks of the piston ring groove 39 of the piston 38 with, for example, iron. For this purpose, the ring electrodes 42 and 43 are connected as anodes, that is, connected via the terminals 53 and 54 to the positive pole of a DC voltage source, the piston 38 is connected as a cathode, that is, connected to the negative pole of the DC voltage source, and is an iron-containing electrolyte, for example an iron solution based on sulfate, introduced via the inlet channel 33 in the coating mask 1.

Die Beschichtungsmaske 1 kann aber auch dazu verwendet werden, die Flanken der Kolbenringnut 39 des Kolbens 38 anodisch zu oxidieren. Hierzu wird der Kolben 38 als Anode geschaltet, d.h., an den positiven Pol einer Gleichspannungsquelle angeschlossen, werden die Ringelektroden 42 und 43 als Kathoden geschaltet, d.h., über die Anschlüsse 53 und 54 an den negativen Pol einer Gleichspannungsquelle angeschlossen, und wird als Elektrolyt beispielsweise Schwefelsäure über den Zulaufkanal 33 der Beschichtungsmaske 1 zugeführt.However, the coating mask 1 can also be used to anodically oxidize the flanks of the piston ring groove 39 of the piston 38. For this purpose, the piston 38 is connected as an anode, that is, connected to the positive pole of a DC voltage source, the ring electrodes 42 and 43 are connected as cathodes, ie, connected via the terminals 53 and 54 to the negative pole of a DC voltage source, and is used as an electrolyte, for example Sulfuric acid supplied via the inlet channel 33 of the coating mask 1.

Soll die Kolbenringnut 39 eines Kolbens 38 beschichtet werden, wird zunächst die Beschichtungsmaske 1 über ihre Öffnungen 3 bis 9 auf die Domen 11 bis 18 der Dehnvorrichtung 19 gemäß Fig. 4 geschoben. Anschließend werde die Domen 11 bis 18 nach radial außen verschoben, sodass die Beschichtungsmaske 1 in Richtung der Pfeile 20 bis 23 gedehnt wird. Nun wird der Kolben 38 in die hierdurch erweiterte, innere Öffnung 2 eingeführt, wonach die Domen 11 bis 18 so weit nach radial innen bewegt werden, bis die Dichtlippen 44 und 45, von denen die Beschichtungsnut 37 begrenzt wird, gemäß Fig. 5 beidseitig der zu beschichtenden Kolbenringnut 39 an der Mantelfläche des Körpers, hier an der Ringpartie 48 des Kolbens 38, zur Anlage gelangen und damit die Beschichtungsnut 37 und die zu beschichtende Kolbenringnut 39 des Kolbens 38 hermetisch verschließen.If the piston ring groove 39 of a piston 38 is to be coated, the coating mask 1 is first of all applied via its openings 3 to 9 to the domes 11 to 18 of the stretching device 19 Fig. 4 pushed. Subsequently, the domes 11 to 18 are displaced radially outward, so that the coating mask 1 is stretched in the direction of the arrows 20 to 23. Now, the piston 38 is inserted into the thereby extended, inner opening 2, after which the domes 11 to 18 are moved so far radially inward until the sealing lips 44 and 45, of which the coating groove 37 is limited, according to Fig. 5 Both sides of the piston ring groove 39 to be coated on the lateral surface of the body, here on the ring portion 48 of the piston 38, come to rest and thus hermetically seal the coating groove 37 and the piston ring groove 39 of the piston 38 to be coated.

Anschließend wird, falls die Flanken der Kolbenringnut 39 mit Eisen beschichtet werden sollen, ein eisenhaltiger Elektrolyt über den Zulaufkanal 33 in die Beschichtungsmaske 1 eingeleitet, werden die Ringelektroden 42 und 43 über die elektrischen Anschlüsse 53 und 54 an den Pluspol einer Gleichspannungsquelle angeschlossen, wird der Kolben 38 über einen elektrischen Anschluss 55 an den Minuspol der Gleichspannungsquelle angeschlossen und wird der überschüssige Elektrolyt über den Ablaufkanal 40 aus der Beschichtungsmaske 1 abgeleitet.Subsequently, if the flanks of the piston ring groove 39 are to be coated with iron, an iron-containing electrolyte via the inlet channel 33 is introduced into the coating mask 1, the ring electrodes 42 and 43 are connected via the electrical connections 53 and 54 to the positive pole of a DC voltage source, the Piston 38 is connected via an electrical connection 55 to the negative pole of the DC voltage source and the excess electrolyte is discharged via the drainage channel 40 from the coating mask 1.

Nach einer gewissen Zeit sind die Flanken der Kolbenringnut 39 des Kolbens 38 in ausreichendem Maße beschichtet, sodass, nachdem der Elektrolyt komplett aus der Ringleitungen 32 und 32' ausgeleitet wurde, die Ringleitungen 32 und 32' und die Beschichtungsnut 37 mit 130 °C heißen Heißdampf gespült werden. Anschließend werden die Domen 11 bis 18 der Dehnvorrichtung 19 nach radial außen bewegt, sodass auch der Durchmesser der inneren Öffnung 2 vergrößert wird und der Kolben 38 aus der Beschichtungsmaske 1 entnommen werden kann.After a certain time, the flanks of Kolbenringnut 39 of the piston 38 are coated sufficiently, so that after the electrolyte has been discharged completely from the ring lines 32 and 32 ', the ring lines 32 and 32' and the coating groove 37 with hot hot steam at 130 ° C. be rinsed. Subsequently, the domes 11 to 18 of the stretching device 19 are moved radially outward, so that Also, the diameter of the inner opening 2 is increased and the piston 38 can be removed from the coating mask 1.

Hergestellt wird die Beschichtungsmaske 1 im Gießverfahren, wobei zunächst in eine Gießform 49, wie sie in Fig. 7 dargestellt ist, zwei Ringleitungsschablonen 50 eingelegt werden, die aus Sinterkunststoff bestehen, und von denen eine in Fig. 6 dargestellt ist. Die Ringleitungsschablone 50 gemäß Fig. 6 lässt den Zulaufkanal 33 und Zuführungskanäle 34, 35, 36, ... erkennen. In der Gießform 49 gemäß Fig. 7 stehen die Zuführungskanäle 34 bis 36 in Verbindung mit einem Gießkem 51, der durch seine spezielle Form gewährleistet, dass beim Gießvorgang die innere Öffnung 2 und die Beschichtungsnut 37 vollständig ausgebildet werden.The coating mask 1 is produced in the casting process, wherein initially in a mold 49, as in Fig. 7 is shown, two loop templates 50 are inserted, which consist of sintered plastic, and of which a in Fig. 6 is shown. The loop template 50 according to Fig. 6 allows the inlet channel 33 and feed channels 34, 35, 36, ... recognize. In the mold 49 according to Fig. 7 are the feed channels 34 to 36 in conjunction with a Gießkem 51, which ensures by its special shape that during the casting process, the inner opening 2 and the coating groove 37 are completely formed.

Die Ringleitungsschablonen 50 verbleiben nach dem Gießvorgang in der Beschichtungsmaske 1 und weisen Sollbruchstellen 52 auf, die beim ersten Beschichtungsvorgang, wenn die Beschichtungsmaske 1 und damit auch die Ringleitungsschablone 50 das erste Mal nach radial außen gedehnt werden, aufbrechen, sodass hierdurch die Elastizität der Beschichtungsmaske 1 nicht behindert wird. Vorteilhaft ist, bei der Herstellung der Ringleitungsschablonen 50 jeweils eine Ringelektrode in die Ringleitungsschablonen 50 mit einzubauen.The ring line templates 50 remain after the casting process in the coating mask 1 and have predetermined breaking points 52, which in the first coating operation, when the coating mask 1 and thus the ring line template 50 are stretched radially outwardly for the first time, so that thereby the elasticity of the coating mask. 1 not hindered. It is advantageous to incorporate in the production of the ring line templates 50 each have a ring electrode in the ring line templates 50 with.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Beschichtungsmaskecoating mask
22
innere Öffnunginner opening
3 bis 103 to 10
Öffnungopening
11 bis 1811 to 18
Domcathedral
1919
Dehnvorrichtungstretching device
20 bis 2320 to 23
Pfeilarrow
24 bis 3124 to 31
BereichArea
32, 32'32, 32 '
Ringleitungloop
3333
Zulaufkanalinlet channel
34 bis 3634 to 36
Zuführungskanalfeed channel
3737
BeschichtungsnutBeschichtungsnut
3838
Kolben, zylinderförmiger Körper, KörperPiston, cylindrical body, body
3939
Kolbenringnut des Kolbens 38, umlaufender BereichPiston ring groove of the piston 38, peripheral area
4040
Ablaufkanaldrain channel
4141
Austrittexit
42, 4342, 43
Elektrode, RingelektrodeElectrode, ring electrode
44, 4544, 45
Dichtlippesealing lip
4848
Ringpartie des Kolbens 38, Mantelfläche des KörpersRing part of the piston 38, lateral surface of the body
4949
Gießformmold
5050
RingleitungsschabloneRing line template
5151
Gießkemcasting core
5252
SollbruchstelleBreaking point
53,54,5553,54,55
elektrischer Anschlusselectrical connection

Claims (7)

  1. A coating mask (1) for electrolytically coating a peripheral region (39) on the jacket surface (48) of a substantially cylindrical body (38) made of metal
    - comprising an inner opening (2), the diameter of which is at least approximately equal to the diameter of the body (38),
    - comprising two sealing lips (44, 45) made of an elastically deformable material, which are disposed in the inner opening (2), are peripheral and delimit a coating groove (37) on both sides, and which can be brought into contact with the body (38) on both sides of the peripheral region (39) and then hermetically seal the coating groove (37) adjacent to the peripheral region (39), thereby permitting an electrolyte to be conducted through the coating groove (37), and
    - comprising at least one electrode (42, 43), which is in contact with the electrolyte and can be connected to the pole of a DC voltage source,
    characterized in that
    the coating mask (1) is made of an elastically deformable material and comprises axially disposed openings (3 to 10) that are distributed in a uniform manner around the periphery, into which rods (11 to 18) of an expansion device (19) can be introduced, said rods being supported in a movable manner such that the expansion device (19) can increase the radial diameter of the coating mask (1) and, therefore, the inner opening (2) to the extent that the cylindrical body (38) can be introduced into the inner opening (2), wherein the radial diameter of the coating mask (1) is selected such that, after a reduction of the radial diameter of the coating mask (1) and, therefore, the inner opening (2), the elastically preloaded coating mask (1) presses the sealing lips (44, 45) of the coating groove (37) against the body (38) on both sides of the peripheral region (39).
  2. The coating mask (1) according to claim 1, characterized in that it is made of rubber.
  3. The coating mask (1) according to claim 1, characterized in that it is made of silicone.
  4. The coating mask (1) according to any one of the claims 1 to 3, characterized in that it comprises regions (24 to 31) between the openings (3 to 10) that have thinner walls than the walls in the regions of the openings (3 to 10).
  5. The coating mask (1) according to any one of the preceding claims, characterized in that it comprises at least one peripheral annular duct (32) between the coating groove (37) and the openings (3 to 30), which is connected to the coating groove (37) by way of supply channels (34, 35, 36), and which is connected to a supply channel (33) for the inflow of the electrolyte and to a discharge channel (40) for the outflow the electrolyte.
  6. The coating mask (1) according to claim 5, characterized in that the electrode (42, 43) is in the form of a peripheral ring electrode and is disposed in the interior of the annular duct (32).
  7. The use of the coating mask (1) according to any one of the preceding claims for coating a piston ring groove (39) of a piston (38) for an internal combustion engine.
EP09776102A 2008-08-19 2009-08-19 Coating mask for electrolytically coating a peripheral region on an outer surface of a cylindrical body Not-in-force EP2326752B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008038323A DE102008038323A1 (en) 2008-08-19 2008-08-19 Coating mask for the electrolytic coating of a circumferential area on the lateral surface of a cylindrical body
PCT/DE2009/001167 WO2010020235A2 (en) 2008-08-19 2009-08-19 Coating mask for electrolytically coating a peripheral region on an outer surface of a cylindrical body

Publications (2)

Publication Number Publication Date
EP2326752A2 EP2326752A2 (en) 2011-06-01
EP2326752B1 true EP2326752B1 (en) 2012-10-17

Family

ID=41566553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09776102A Not-in-force EP2326752B1 (en) 2008-08-19 2009-08-19 Coating mask for electrolytically coating a peripheral region on an outer surface of a cylindrical body

Country Status (8)

Country Link
US (1) US8864966B2 (en)
EP (1) EP2326752B1 (en)
JP (1) JP3170666U (en)
KR (1) KR101626633B1 (en)
CN (1) CN202039140U (en)
BR (1) BRPI0917367A2 (en)
DE (1) DE102008038323A1 (en)
WO (1) WO2010020235A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015222862A1 (en) 2015-11-19 2017-05-24 Mahle International Gmbh Method for coating at least one piston groove provided on a piston with a protective coating and coating device, in particular for carrying out the method
JP6371354B2 (en) * 2016-09-30 2018-08-08 本田技研工業株式会社 Film forming device
CN111501028A (en) * 2020-04-30 2020-08-07 中国航发哈尔滨东安发动机有限公司 Protection method with sealing structure and sealing protection tool

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5521502A (en) * 1978-07-25 1980-02-15 Sumitomo Metal Mining Co Ltd Method and device for partial plating
JPS6473080A (en) * 1987-09-11 1989-03-17 Honda Motor Co Ltd Jig for surface treatment of piston for internal combustion engine
JP2001073080A (en) 1999-08-31 2001-03-21 Nippon Steel Corp High tensile strength steel excellent in delayed fracture characteristic and its production
JP3934891B2 (en) 2001-01-15 2007-06-20 株式会社日立製作所 Anodizing method and apparatus
DE102006020593A1 (en) * 2006-05-02 2007-11-15 Mahle International Gmbh A mask for electroplating the outer surface of a body made of an electrically conductive material and method for producing the mask

Also Published As

Publication number Publication date
US20120085654A1 (en) 2012-04-12
CN202039140U (en) 2011-11-16
EP2326752A2 (en) 2011-06-01
WO2010020235A2 (en) 2010-02-25
US8864966B2 (en) 2014-10-21
DE102008038323A1 (en) 2010-02-25
JP3170666U (en) 2011-09-29
WO2010020235A3 (en) 2010-06-10
BRPI0917367A2 (en) 2015-11-17
KR101626633B1 (en) 2016-06-01
KR20110049804A (en) 2011-05-12

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